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Moving Filter Monitor BAI 9128

The BAI 9128 moving filter monitor is an easily transportable instrument for the measurement of airborne Alpha and Beta particulates. The compact design integrates a sampling head with detector, pump unit and control electronics in a 19" format. An S-class glass fibre filter tape collects the sample air particlulates and advances at a programmable continuous speed, eliminating the need for frequent filter replacement due to dust loading.

A rugged silicon detector allows the measurement of both Alpha and Beta particulates. Optimal performance is achieved through mounting the detector above the dust collection area and close to the filter. A compensation algorithm eliminates Radon progeny from the gross Beta activity, and a silent pump unit provides a stable flow rate of 3 m3/h. The 3-channel LB 5310 electronic evaluation unit processes the detector signals, allowing the user to measure the presence of radioactive aerosols as well as the ambient dose rate, and trigger alarms above certain levels. The healthy status of the system is continuously monitored.

General Applications All applications where airborne alpha and beta particulate radioactivity has to be measured:
  • to prevent personnel exposure
  • to measure release rates in ducts and stacks
  • decommissioning
  • nuclear power
  • source manufacturing
  • industrial safety
  • research
 wide area monitoring of dose rate
Specific Applications In hostile environments where a moving filter monitor has advantages:
  • workplace or stack monitoring with high dust concentrations
  • decommissioning with abrasive material removal
  • trituration process monitoring
  • phosphate manufacturing
  • waste disposal sites
  • fuel reprocessing
  • where space is at a premium: mobile labs, intervention vehicles, submarines
  • where movable intervention equipment is needed: on the spot monitoring, temporary access gates to controlled areas
 table top configuration

BAI 9128-T Table top model

Versions

BAI 9128: Cassette 6 HU for integration into 19" cabinets, counting electronics not included

BAI 9128-T Table top model (see picture above)

BAI 9128-MOB Cart model:

mobile configuration

BAI 9128-MOB Cart model
  • movable spider wheel cart, 2x3 wheels
  • detection limit for Beta to DIN 25482, <0.04 Bq/m3 at 1hr collection and measuring time
  • detection limit for Alpha to DIN 25482, <0.004 Bq/m3
  • Si-CAM 600mm2 detector for simultaneous Alpha-Beta measurement
  • compensation for natural activity
  • measurement of ambient doserate
  • measurement of natural activity (Radon-Thoron progeny)
  • separate warning beacon with 10m cable
  • selectable filtertape advance speed (5, 10mm/h)
  • filtertape autonomy for up to 10 months with filter change warning
  • silent pump with low flow check
Typical Detection limits
BAI 9128, Bq/m3, filter speed 2.5 mm/h, 3 sigma values
Time Alpha Beta
10 min 0.016 0.096
30 min 0.009 0.056
1 h 0.006 0.039
2 h 0.005 0.028

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